Will Be Participating In A Live Cake Decorating Contest...need Ideas.

I have a few ideas but figured it'll be nice to hear some ideas from you all so I can work on my final design for the contest. I've been selected as 1 of the 3 contestants to participate in a live cake decorating contest. Will be going in with 2 round dummy cakes covered in fondant and will have approx 1 hour to finish the cake off. I am allowed to make decorations prior to the event.

Here are a few background info/rules/themes to know before suggesting some designs.

Bottom tier: The location you have the contest at with some people lifting up and pushing the second tier (gravity defying piece of round cheese- not halal) over the edge. Lol. First thing that popped in my head, sorry.

What exactly are the rules? Do you have to use both dummies? Can you use more? What size are they? What are you allowed to do at home exactly?